Materials Literature
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The thermal conductivity λ(x=0,0.15,0.3,0.6;T=2–200 K) and electrical resistivity ρ(0⩽x⩽0.5;T=6–300 K) of layered crystals Nb1−xSnxSe2 are measured in the ab plane. The metal– semiconductor transition is observed at x≈0.5. The magnitude of the resistivity anomaly observed at 33 K and associated with a transition to th…
The Ca2+-transporting ATPase has been labeled with N-cyclohexyl-N'-(4-dimethyl-amino-alpha-naphthyl)carbodiimide (NCD-4), a fluorescent carbodiimide which reacts with carboxyl groups of acidic residues. It has been reported that NCD-4 labels a transmembrane portion of the protein at the high-affinity calcium-binding s…
Promoted by the European Steel Industry under the sponsorship of ECSC, the multinational megaproject on “Scrap recycling for high quality products” aims particularly at a clear quantitative assessment of the effects of the tramp elements on the steel properties. The most relevant results gained at the two thirds of th…
Article Crystal structure of the clathrates Rb8Ga8Sn38, Rb8Ga8Ge38 and Rb8Ga8Si38 was published on April 1, 1998 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 213, issue 1-4).
Abstract Biomaterials may be defined as artificial materials which fulfill the mechanical requirements and interact with the biosystem they are in contact with in same way as a natural material would react in the same place. While the requirements of mechanical properties can be reached by suitable organo‐polymeric an…
Abstract : Composite materials are found to lose mechanical on exposure to aircraft operating environments. This is mainly due to absorption of moisture from humid air by the matrix material. Composite materials are extensively used by the RAAF for both major structural components on the F/A-18 and for bonded repairs…
Using 58 keV (0.214 Å) synchrotron radiation we have obtained virtually extinction-free data on Al 2 O 3 . Refinement of a multipole model against these data produced deformation densities of high quality, which compare well with theoretical maps.
Article Crystal structure of tris(2,2'-bipyridine)iron(II) bis(hexafluorophosphate), (C10H8N2)3Fe(PF6)2 was published on April 1, 1998 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 213, issue 1-4).
Core and valence band XPS spectra were obtained from a lead metal foil. The XPS data were collected with a VSW HA150 spectrometer equipped with a monochromatic Al Kα x-ray source and multichannel detector. The sample is a high purity lead foil (99.99%) that was cleaned prior to data collection by Ar-ion sputtering. Th…
Anthropometric data for the purpose of spectacle frame design are scarce in the literature. Definitions of facial features to be measured with existing systems of facial measurement are often not specific enough for frame design and manufacturing. Currently, for individual frame design, experienced personnel collect d…
Abstract Luminous properties of a red phosphor, Eu–Y2O3 (Eu-doped Y2O3) have been studied by 89Y (nuclear spin 1/2)-static NMR. Pure Y2O3 showed an anisotropic pattern with the peak centered at 299 ppm assigned to the Y atom in the site, where none of the 12 nearest neighbouring Y atoms are substituted by an Eu atom.…
Abstract Extruded thermoplastic sheet is widely used in the production of thin‐gauge tubs and containers for the food and beverage industry using the thermoforming process. The production of high quality thermoformed parts is critically dependent on the standard of extruded sheet feedstock used. The extrusion process…
Abstract A comparative study of NO and N2O decomposition over Cu/ZSM-5 and Cu/Y zeolites with various Cu loading levels has been carried out at 523—823 K. The Arrenhius plot of NO decomposition tended to level off above 773 K, as reported in the literature, while that of N2O decomposition was linear. It was noted that…
The structure and formation mechanisms of low-angle grain boundaries (LAGB) in chlorite have been investigated using HRTEM to resolve each cation sheet in chlorite. The LAGB are abundant in two hydrothermally formed ferromagnesian chlorite specimens. Abundant LAGB, which are almost parallel to (001), divide chlorite g…
The mesogenic 4,4′-bis[4-(n-octyloxy)benzoyloxy]azobenzene (HL) ligand reacts with [(PhCN)2PdCl2] to give the dinuclear cyclometalated complex [(μ-Cl)(L)Pd]2 (1), from which the mononuclear half-sandwich [(η5-C5H5)(L)Pd] (2) species has been obtained by reaction with Tl(C5H5). The PtII analogue of 2, [(η5-C5H5)(L)Pt]…
The room‐temperature tensile strengths of chemically‐vapor‐deposited SCS‐6 silicon carbide fibers were measured after 1 to 400 h heat treatments in 0.1 MPa of argon at temperatures up to 2100°C. The fibers heat‐treated for 1 h above 1400°C and those heat‐treated for 400 h above 1300°C showed strength degradation. Scan…
A series of Mo/TiO2 catalysts was prepared by equilibrium adsorption from aqueous solutions of (NH4)6Mo7O24 by varying the pH of the solution from 9.8 to 4. The Mo loading increases from 0.8 to 3.6 wt.% as the pH of preparation decreases. The surface coverage of the calcined catalysts was monitored by CO2 chemisorptio…
Barium titanate ceramic samples of four different average grain sizes from 0.5 µm to 20 µm were studied by means of the ac calorimetric method. The ferroelectric-to-paraelectric transition temperature decreased with decreasing grain size. The temperature dependence of heat capacity showed hysteresis during a heating/c…
Several charge-transfer (CT) complexes derived from 1,5-diphenyl-3-(p-substituted-phenyl)- verdazyl radicals and TCNQF 4 (2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane) or DDQ (2,3-dichloro-5,6-dicyano-1,4-benzoquinone) were prepared and their magnetic properties were investigated. The X-ray crystal structural…
Abstract A computer‐based method is described for the determination of the interfacial tension between pendant and sessile drops in a surrounding continuous phase. This has been used to determine the effect on interfacial tension of increasing amounts of aliphatic alcohols, from methanol up to n‐octanol, equilibrated…